Walt stages his own death.
Jesse gets away in the car but Gomez and Hank are killed. The Nazis dress one of their own dead in Walt's clothes, put Walt's wallet on him, and put him in the back of the police truck and set it on fire. They stage Walt's death, and Walt goes into hiding with the Nazis, taking his barrels of money along.
In the finale, Walt comes out of hiding to exact revenge on Jesse.
When Walter "dies", the video confession (condemnation of Hank) is automatically released to DEA headquarters. Hank's good name and reputation are shattered. Marie is the ONLY person left who wants to get the truth out. This situation pushes her over the edge. As a result, Marie kills Skylar (or the kids, or everyone).